Research On Energy Conservation Of Evaporative Condensing Chiller And Application To Computer Room Air Condition

Computer as one of the greatest inventions in20th century is making an important part tohuman. It is necessary to keep computer running safely, stably and reliably. Computer is easyto be influenced by environment which is meanly control by computer room air condition, soit’s important to make more research on computer room air condition. Moreover, because ofthe energy issue and policies, developing high efficiency, energy-saving, stably computerroom air condition seems significant.Basic on the research of evaporative condensing chiller, with an aim of application,evaporative condensing chiller is considered to be promoted and applied in computer room aircondition. This paper developed software for system optimization; did performance tests andcomparison among water-cooling chiller, evaporative condensing chiller, and evaporativecondensing chiller with optimization; Developed evaporative condensing design software,which made the design more simple.The following researches were involved in this paper:Analysed influence of temperature, humidity, dust, electromagnetic, noise andsummarized air demand of different kinds of computer room. On the basis of the demand ofcomputer room air condition this paper pointed out that evaporative condensing chiller is highefficient, stabile, energy-saving, water-saving. With many advantages evaporative condensingchiller was suitable to be used in computer room air condition.With a view to the whole system, this paper developed a optimization software forevaporative condensing chiller using VB. Using the software this paper run a case and theresults showed that: dry-bulb temperature was33℃, wet-bulb temperature was27℃,evaporative temperature was5℃, condensation temperature was38℃, load rate was100%,flow rate of pump was14kg/s, flow rate of fan was20.7m~3/s, the max EER was4.821, EERincreaseed7.03%; when load rate was80%, flow rate of pump was12kg/s, flow rate of fanwas13.2m~3/s, the max EER was4.866, EER increaseed11.31%; when load rate was60%,flow rate of pump was10kg/s, flow rate of fan was8.0m~3/s, the max EER was4.900, EERincreaseed17.14%; when load rate was40%, flow rate of pump was8kg/s, flow rate of fanwas4.3m~3/s, the max EER was4.931, EER increaseed28.03%. Comparison of different load rate showed that the lower the load rate was, the more the EER increased.This paper did a performance tests in an air condition application project. The resultsshowed that among three modes, evaporative condensing chiller with optimization had thebest performance. Under different load rate, the EER kept higher than4.0and variation ratekeep lower than2.2%. When load rate was100%, evaporative condensing chiller withoptimization, comparing water-cooling chiller, p increased14.0%performance and could save12.8%power. Comparing evaporative condensing chiller, evaporative condensing chiller withoptimization increased0.6%performance and could save0.8%power. When load rate was41%, evaporative condensing chiller with optimization, comparing water-cooling chiller,increased59.0%performance and could save37.8%power. Comparing evaporativecondensing chiller, evaporative condensing chiller with optimization increased9.5%performance and could save9.3%power.Using Visual Basic this paper developed evaporative condensing chiller design software.Checking results showed that largest error lower than10%, the smallest error was only0.1%.